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ID Date Author Type Category Subjectup Text Attachments
  46   Wed Dec 26 14:33:33 2012 KojiFacilityGeneralLase Interlock wiredTwo switches are connected in series.  PC263073.jpgPC263074.jpgPC263075.jpg 
  15   Sat Aug 11 00:59:14 2012 KojiFacilityGeneralLaser Safety BarrierIt seemed that a laser safety barrier was
installed today!?
 P8131960.JPG 
  122   Wed May 8 15:36:50 2013 KojiGeneralGeneralLatest OMC schedule
May
(done) Mon  6th:
Invar plate arrival / Spot position measurement
(done)
Tue  7th: Invar plate cleaning / Spot position
  
  82   Tue Mar 26 22:33:07 2013 KojiGeneralGeneralLoan for the OMC buildingLoan from PSL Lab
- 300mm mirror with Ultima mount
and pedestal
  
  248   Fri Dec 18 15:33:24 2015 KojiGeneralLoan / LendingLoan from RichLoan Record: I borrowed a PD can opener
from Rich => Antonio Returned Sep
9, 2016
  
  26   Fri Oct 12 17:15:19 2012 KojiOpticsGeneralLoan from the 40m / ATF
    HWP set
         
    
  
  355   Thu Apr 25 15:05:19 2019 JoeOpticsCharacterizationLooking at PZT HOM spacing dependance and thinking about workflow[koji, joe]

The template or glass breadboard
was wobbling, and we noticed that the caivty
  
  94   Thu Apr 4 00:35:42 2013 ZachOpticsConfigurationMMT installed on breadboard, periscope built[Koji, Zach]
 2013-04-03_23.43.00.jpg 
  183   Mon May 12 22:43:02 2014 KojiOpticsCharacterizationMeasured FSR/TSM of the OMC cavityData analysis of the FSR/TSM measruement
last week.
1. FSR was measured with "the
 Cav_scan_response_Pitch.pdfCav_scan_response_Yaw.pdf 
  96   Thu Apr 4 01:43:06 2013 KojiOpticsCharacterizationMirror T measurement[Zach, Koji]
The measurement setup for the transmission
measurement has been made at the output of
  
  40   Sat Nov 17 02:31:34 2012 KojiOpticsCharacterizationMirror T testMirror T test
The mirror was misaligned to have
~2deg incident (mistakenly...) angle.
  
  91   Mon Apr 1 18:17:01 2013 KojiOpticsGeneralMirror curvature center testLocations of the curvature minimum
on the OMC curved mirrors have been measured.
 6x 
  113   Tue Apr 16 09:43:58 2013 KojiOpticsConfigurationMirror list for L1OMCL1 OMC
Cavity Mirrors
FM1 (input coupler): A8
 OMC_breadboard_mirror_config.png 
  151   Fri Aug 16 15:31:17 2013 KojiOpticsConfigurationMirror list for OMC(002)OMC(002)

Cavity Mirrors

FM1 (input coupler): A9
  
  101   Mon Apr 8 11:29:08 2013 KojiOpticsCharacterizationMirror/PZT Characterization links
    Mirror
List
    http://nodus.ligo.caltech.edu:8080/OMC_Lab/152
  
  179   Fri Feb 28 19:50:11 2014 KojiGeneralGeneralMisalignment ABCD matrix for the aLIGO OMCRelationship between mirror misalignment
and cavity mode shift was calculated.
The technique described in T0900647
 misalignment.pdf 
  216   Tue Aug 5 13:03:25 2014 KojiGeneralGeneralMissing cable componentsDCPD Connector Face: Qty2 https://dcc.ligo.org/LIGO-D1201276
QPD Connector Face: Qty2 https://dcc.ligo.org/LIGO-D1201282
PD faster: 92210A07 Qty 4: MCMASTER
  
  95   Thu Apr 4 01:35:04 2013 KojiOpticsCharacterizationMode matching to the OMC cavityThe fiber output was matched with the lenses
on a small bread board.
The detailed configuration is found
  
  8   Wed Jul 18 23:20:13 2012 KojiOpticsCharacterizationMode scan results of ELIGONic Smith sent me a bunch of elog lists
where the results of the mode scan can be
found.
  
  305   Wed Aug 8 17:32:56 2018 Rich AbbottGeneralCharacterizationModulation Index Test Setup at 40m LabAttached is a block diagram of the test
setup used in the 40m lab to measure the
modulation index of the IO modulator
 40mLabModIndexSetup.pdf 
  306   Thu Aug 9 11:24:29 2018 KojiGeneralCharacterizationModulation Index Test Setup at 40m Lab[Rich Koji]

The impedances of the new LLO EOM
were measured with the beat note setup at
 modulation_depth.pdfmodulation_depth_zoom.pdf 
  308   Sun Sep 23 19:42:21 2018 KojiOpticsGeneralMontecarlo simulation of the phase difference between P and S pols for a modeled HR mirror[Koji Gautam]


With Gautam's help,
I ran a coating design code for an HR mirror
 reflectivities.pngtransmission.pngphase_diff.pngphase_difference_histogram.png 
  309   Thu Sep 27 20:19:15 2018 AaronOpticsGeneralMontecarlo simulation of the phase difference between P and S pols for a modeled HR mirrorI started some analytic calculations of
how OMC mirror motion would add to the noise
in the BHD. I want to make some prettier
  
  310   Thu Nov 1 19:57:32 2018 AaronOpticsGeneralMontecarlo simulation of the phase difference between P and S pols for a modeled HR mirrorI'm still not satisfied/done with the
solution to this, but this has gone too long
without an update and anyway probably someone
  
  100   Mon Apr 8 11:11:37 2013 KojiOpticsCharacterizationMore Mirror T measurementMore Ts of the mirrors were measured.
A mirror specification:
Request: 8300+/-800 ppm
  
  42   Mon Nov 26 01:40:00 2012 KojiOpticsCharacterizationMore RoC measurementC1: RoC: 2.57845 +/− 4.2e−05m
 RoC_measurement.pdf 
  182   Thu Apr 17 21:39:25 2014 KojiOpticsGeneralMore alignmentSTORY:
- The cavity mirrors have scattering
spots. The cavity alignment should have been
  
  260   Tue Apr 5 21:20:15 2016 KojiElectronicsCharacterizationMore dark noise measurementAll survived PDs have been measured.  PD_dark_current.pdf 
  64   Wed Feb 27 18:18:48 2013 KojiOpticsConfigurationMore perpendicularity testMounting Prisms:
(criteria: 30arcsec = 145urad =>
0.36mm spot shift)
  
  65   Fri Mar 1 23:06:15 2013 KojiOpticsConfigurationMore perpendicularity test finalPerpendicularity of the "E" mirror
was measured.

Mounting Prisms:
  
  243   Thu Sep 10 04:03:42 2015 KojiOpticsCharacterizationMore polarizer optics measurement (Summary)Brewster calcite PBS (eLIGO
Squeezer OFI)

Loss L = 3600 +/- 200ppm
 eLIGO_PBS.pdfHWP.pdfTFP.pdfGlasgow_PBS.pdf 
  244   Wed Sep 23 17:49:50 2015 KojiOpticsCharacterizationMore polarizer optics measurement (Summary)For the Glasgow PBS, the measurement has
been repeated with different size of beams.
In each case, the PBS crystal was
 Glasgow_PBS_spotsize.pdf 
  35   Thu Nov 8 13:24:53 2012 KojiOpticsCharacterizationMore wedge measurementA1
Horiz Wedge    0.497   
+/-    0.004 deg
 wedge_measurement_overall.pdf 
  116   Thu Apr 18 11:43:59 2013 KojiGeneralGeneralMounting Glass Bracket Failure[Jeff, Koji]
- While we were working on the optics
alignment, one of the mounting brackets made
  
  124   Mon May 13 14:49:35 2013 KojiMechanicsCharacterizationMounting Glass Bracket still broke with tightenin stress[Koji / Jeff]
This is the elog about the work on
May 9th.
  
  353   Tue Apr 23 10:21:12 2019 JoeOpticsConfigurationMoving the spots to the centre of the curved mirrors[Koji,Philip, Liyuan, Joe]

CM1:

We moved the curved mirrors to
 FSR_detuned_locking.pdfCM1_IMG_7702.JPGCM2_IMG_7704.JPG 
  75   Sat Mar 23 02:32:23 2013 KojiFacilityGeneralN2 cylinder deliveredPreparation for ionized N2 blow
- 99.9998% N2 cylinder delivered
(ALPHAGAZ 2 grade by AIR LIQUIDE) ALPHAGAZ
 P3233349.jpg 
  304   Tue Aug 7 15:43:12 2018 KojiElectronicsCharacterizationNew LLO EOM stuffed[Rich, Dean, Koji]

Stuffed all inductors for the new
LLO EOM. As the impedances were sensitive
 P_20180806_154457.jpgimpedance_eom.pdfimpedance_eom_zoom.pdf 
  71   Thu Mar 14 22:18:23 2013 KojiGeneralGeneralNew loans for the diode testALL
returned

Loan
from ATF:
  
  301   Tue Jul 3 12:07:47 2018 Rich AbbottElectronicsCharacterizationNotes on 3rd IFO EOMAttached please see my notes summarizing
the models for the electrodes and inductors
within the 3rd IFO EOM
 EOM_Analysis2.pdf 
  223   Wed Feb 18 21:51:23 2015 KojiGeneralGeneralNotes on OMC Transportation Fixtures & PelicanLLO has one empty OMC transportation fixture.

LHO has one empty OMC transportation
fixture.
  
  281   Fri Jun 23 01:58:11 2017 KojiOpticsGeneralOMC #002 Repair - CM1 gluing[Alena, Koji]

Jun 21: Alena and Koji
worked on gluing of the CM1 mirror on the
 6x 
  319   Tue Mar 19 17:30:25 2019 KojiGeneralCharacterizationOMC (002) Test itemsOMC #002 Optical tests


FSR
measurement (done, 2019/1/8-9, 2019/4/1)
  
  325   Fri Apr 5 23:30:20 2019 KojiGeneralGeneralOMC (002) repair completedOMC(002)
repair completed

When the cable harness of OMC(004)
 P_20190405_222401.jpgP_20190405_222509.jpgP_20190405_222529.jpg 
  127   Tue May 14 19:06:00 2013 KojiCleanGeneralOMC BakingThe OMC is in the air bake oven now.
  
  387   Fri Dec 13 14:59:18 2019 StephenGeneralGeneralOMC Beam Dump Production Cure Bake[Koji, Jordan, Stephen]

The beam dumps, bonded on Fri 06
Dec 2019, were placed in the newly tuned
 IMG_6080.JPGIMG_6079.JPG 
  388   Wed Dec 18 21:54:53 2019 KojiGeneralGeneralOMC Beam Dump Production Cure BakeThe beamdumps were taken out from the oven
and packed in bags.

The bottom of the V are completely
 P_20191218_160650_vHDR_On.jpegP_20191218_160705_vHDR_On.jpegP_20191218_160733_003.jpeg 
  393   Mon Sep 28 16:03:13 2020 ranaGeneralGeneralOMC Beam Dump Production Cure Bake
are there any measurements of the BRDF
of these things? I'm curious how much
light is backscattered into the incoming
  
  394   Mon Sep 28 16:13:08 2020 KojiGeneralGeneralOMC Beam Dump Production Cure BakeAccording to the past backscatter test
of the OMC (and the black glass beamdump:
not V type but triangular type on a hexagonal-mount),
  
  110   Sat Apr 13 21:06:02 2013 KojiOpticsGeneralOMC Bottom-side: cavity glued[Jeff, Zach, Lisa, Koji]
Gluing of the cavity mirrors went
 Cav_scan_response_130412_Pitch.pdfCav_scan_response_130412_Yaw.pdf 
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